Galeria de Modelos

A Galeria de Modelos possui arquivos do COMSOL Multiphysics de várias áreas de aplicação incluindo elétrica, mecânica, escoamento e química. Você pode baixar modelos prontos e também tutoriais passo-a-passo para montar seu modelo, e usá-lo como ponto de partida para o seu próprio modelo. Use a função de busca "Quick Search" para encontrar modelos na sua área de interesse e faça o login ou o seu cadastro no COMSOL Access, cadastrando a sua licença do COMSOL, para poder baixar os arquivos.

Probe Tube Microphone, Transient Model - new

It is often not possible to insert a normal microphone directly into the sound field being measured. The microphone may be too big to fit inside the measured system, such as for in-the-ear measurements for hearing aid fitting. The size of the microphone may also be too large compared to the wavelength, so that it disturbs the acoustic field. In these cases, a probe tube may be attached to the ...

Optimizing the Shape of a Horn - new

A plane-wave mode feeds an axisymmetric horn radiating from an infinite baffle towards an open half space. The radius of the feeding waveguide is assumed to be fixed, as well as the depth of the horn and the size of the hole where the horn is attached to the baffle. By varying the curvature of the initially conical surface of the horn, its directivity and impedance can be changed. This model ...

Acoustic Scattering Off an Ellipsoid - new

This is a tutorial model that illustrates the use of the scattered field formulation in acoustics. A solid object (here an ellipsoid) is hit by an incident plane wave field (background pressure field). The model solves for the scattered field. The model uses a PML and a far-field calculation is also added. The mesh is set up to enhance the PML and the far-field performance. ...

Radially Polarized Spherical Piezoelectric Acoustic Transducer - new

This tutorial provides a step-by-step instruction to setup a fully-coupled 3D structural-acoustic interaction problem. Interaction between a vibrating spherical piezoelectric structure with the surrounding fluid media is considered. The piezoelectric material PZT-5H from the materials library is used. Instructions on how to create a radially polarized piezoelectric material in spherical ...

Tuning Fork with Acoustics

Acoustic-Structural Interaction in a Tuning Fork This model simulates a tuning fork for tuning musical instruments which, if correctly designed, should sound the note of A, 440 Hz. First an eigenfrequency analysis is performed on this structure to ensure its fundamental frequency is exactly 440 Hz. Then the interaction between the structural vibrations in the tuning fork and the acoustic ...

Transient Gaussian Explosion - new

An ellipse with sound-hard walls has the interesting property that an acoustic signal emanating from one of the foci refocuses at the other focal point b/c seconds later, where b (in meters) is the major axis length and c (m/s) is the speed of sound. This model involves a Gaussian explosion at one focus of an ellipse to illustrate some properties of time-dependent acoustic problems. The ...

Lumped Loudspeaker Driver - new

This is a model of a moving-coil loudspeaker where a lumped parameter analogy represents the behavior of the electrical and mechanical speaker components. The Thiele-Small parameters (small-signal parameters) serve as input to the lumped model, which is represented by an Electric Circuit physics. The lumped model is coupled to a 2D axisymmetric Pressure Acoustics model describing the surrounding ...

Vibrations of a Disk Backed by an Air-Filled Cylinder - new

The vibration modes of a thin or thick circular disc are well known, and it is possible to compute the corresponding eigenfrequencies to arbitrary precision from a series solution. The same is true for the acoustic modes of an air-filled cylinder with perfectly rigid walls. A more interesting question to ask is: What happens if the cylinder is sealed in one end not by a rigid wall but by a thin ...

Radially Polarized Piezoelectric Transducer

This tutorial model shows how a user-defined coordinate system can be used to create any type of directional polarization of a piezoelectric material. Results are shown for the case of radial polarization of a piezoelectric disk. The piezoelectric material is PZT-5H. The example shows a static analysis. Visualization of the cylindrical coordinate system as well as the stress/strain in that system ...

Acoustic Levitator - new

An ultrasonic standing wave levitator, also called acoustic levitator, is a device used for levitating fluid and solid particles in an acoustic field. The standing acoustic waves exert an acoustic radiation force on the particles. The force is a second order effect and stems from a combination of the time averaged pressure and inertial interaction between the particles and the acoustic field. By ...

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